> My recent Executel addition has a 5" screen with associated analogue board > that seems to be powered from a display chip I can't find any info on, and
Well, it won't be _powered_ from that IC. My guess is that said IC provides the HSync and VSync signals, the video comes from other devices on the main PCB. But that is a guess without seeing the machine/ [...] > I've also removed, checked and replaced out of spec capacitors, one of them > was a 680nF 50V radial. I could only find a 63V PET version on cpc's website > and did much reading on differing capacitor types, concluding that it SHOULD > be OK. I would be very surprised if that was not OK. [...] > Hence the question - am I wasting my time without a schematic for this > analogue board? You haven't told us what the problem is. Do you get anything on the screen? Is the CRT heater glowing? Have you measured the CRT pin voltages? I can see one IC on that 'analogue board'. Looks to have metal heatsink tabs so I am going to make a wild guess that it's a TDA1170 vertical deflection IC Are there any other ICs on the board? My guess is that the 'analogue board' could be reverse-engineered without too much work. Can you provide a clear picture of the component side of the board with nothing else in the way? -tony
